#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<string>
using namespace std;

class Solution {
public:
    char findTheDifference(string s, string t)
    {
        int ret1 = 0;
        int ret2 = 0;
        for (int i = 0; i < s.size(); i++)
        {
            ret1 += s[i];
        }
        for (int j = 0; j < t.size(); j++)
        {
            ret2 += t[j];
        }
        return ret2 - ret1;
    }
};